Why this is a good first issue

a tiny but useful copy fix in contributor-facing guidance.

Evidence

the example raises FileNotFoundError(f"empty file not present: {input_path}"), which does not match the condition being checked.

Likely files

• tests/AGENTS.MD or tests/AGENTS.md if renamed in the same PR`

Acceptance criteria

• make the message match the missing-file condition
• preserve the rest of the example and guidance

First-time contributors

This issue is intentionally scoped to be approachable for first-time contributors: one focused change, clear files, and low regression risk.